How do I form the perfect tense in French?

The perfect tense is used in French to described completed actions in the past, such as 'I ate an apple' or 'I have done my homework' .e.g. Je mange une pomme = I eat an apple (present tense) // J'ai mangé une pomme = I ate an apple (perfect tense) It is formed with an auxiliary ('helping') verb and the past participle of the main verb. The helping verb is either avoir (to have) for most verbs, or a certain number of verbs take être (to be) as their auxiliary verb. You conjugate the auxiliary verb normally as you would in the present tense.e.g. - AVOIR: j'ai, tu as, il/elle a, nous avons, vous avez, ils/elles ont // ÊTRE: je suis, tu es, il/elle est, nous sommes, vous êtes, ils/elles sont To create the past participle of the main verb, there are different rules depending on whether it is a verb ending in -er, -ir or -re.e.g. ER verb - manger --> mangé // IR verb - finir --> fini // RE verb - vendre --> vendu If the auxiliary verb is être, the past participle will also agree: it has an extra 'e' on the end if the subject is feminine and/or an extra 's' is the subject is plural.e.g. Elle est arrivée // Ils sont restés